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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b10397744c4feba76fa6e66d68a045583c0927febef581506f23253fdad88be7' 
  AND token = 'LfB7SbG6O4c2Lgprm+ZCLIf4ZMt5F0iW7v7lPgX7JRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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