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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61811ff88fa69b18b5c219dba1f08ee6fdc0c86de5df32d6571ce83151c33f30' 
  AND token = 'LIddnXy5OheeERrVUa8cRTMIHml9Cej21QoOD650Uc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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