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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f932e45aa830b8b50b3be0e8c68b521014ec2f9cf915199be0c962a5c38cdae6' 
  AND token = 'RaQuufmTFzKWAnVvJml4M8MbpjN8HDvq9qsee67LGPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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