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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f7207bf99a5832a9b21821cde54238129b597a3b907c355d2f2e53d0faac9a0' 
  AND token = 'ZVFU77cf9ajeuvHCyHY2dl0Y061mOspJaP9GRkoc3ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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