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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b20ac1e4c98ae74a4cdfcbe135b4b81177b12a849e9a23d00022297c3e0f8e26' 
  AND token = 'xSKFiQLZ4hkqtJFgAw9TGfiiw33rJEvbH4DiIvgkgoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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