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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28b1b4453e8e765c32c7eb5b6ed8c5b3f9e3c9dd88fd9d8f3d4e5436c1769497' 
  AND token = 'Jn+dF17VGdp9uP7y1aBP89ugF1wSAB3SBUj2UcwZSnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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