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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b047620985184a24cd0dd117943104791c255fa6c83f562d34550d144e8a4e5' 
  AND token = 'FFXsWUx6zcIo06oluhj5dpobXCpl1JWJOeLF2wtDna0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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