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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a3b466394aceab94c1a60de7dbb3afd7a5135465a1f1fcb89cb6a450b5b3ac5' 
  AND token = 'Wfs0URTjHB0JxDrlGkcYaQjIH39F/ka+zaWndtkSOHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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