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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c72f011ecc53d132abf3508770dd1501c9d3b5318724855f4e8025bf0678fcc2' 
  AND token = 'vyz4E81hwWKJrhABcp2arws9yxrRSY9wKAnW8s/YwEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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