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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'faebf2ff315bdacb1a0cf312e56617d6f7da7e68d03ae38895988800276a7627' 
  AND token = '0cPRkcGuPNLJTNl9ajGAtqUNjVxGS1Aa7FcXTMJWHG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}