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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ded0b2737bbd834c1f9e2221b1da30e9f8dfba504320cf78a6f66b04a2e45a4e' 
  AND token = 'oEcm5LyMDO2dDVKXTKscE6yiKn9mmh30t+3M2o4v+PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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