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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebbefa49b619ecef43e609992db11fd6c2aaa64ec49aa4b548a2dd80dfbdacad' 
  AND token = 'cHxvdOiqdR8LzN+a27E5poJMUV/272WvS5PAfr4lLi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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