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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e62624121b6708db9f6626a2f5881f89847c137b96ecc4420b151b12be54513' 
  AND token = 'FLw3d2jjjU2jbSIGYz1q4rRnldesa+nD+cuU79NsCR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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