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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df12a57261be7c1367231058f564070b4e77503e5b03dd4d1f977e814cf96e41' 
  AND token = 'VWy3KYTUYAqDIzzNSP2OfLQXe2X2683GHDNjfzfLLm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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