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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb1ef5ef023ef263e1539928fb629d5709448c250b62681213fce7f1d39304d4' 
  AND token = 'hO272f8y5bTbtG0/8Tgi5LyqYcI1KyPNpdoBeZyK+Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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