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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2e88aa479d610a23be505a8c7600bd7517653c1ec0bf97c306b326284345b61' 
  AND token = 'uvpmYYKwSwnxDDD+fr8Bn8Ec0Rva/TYiNnr3lYn6G3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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