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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b47bf9f7eba1c42cb9a206087fd7a7fe06cc4862c51966e478a58a090ecca1c9' 
  AND token = 'gefDVc4L8wG3Xl5BozKYLifTswgkpXYRc6ueSw5k/jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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