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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2958b1627c45ed0cd23a2fb833ca3eee033129096f341a5f73d96e7d5e46a19e' 
  AND token = 'fGB9mURJNjStde8kLg8f42SwnXw+G/054osRGrm8tt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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