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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b07e8bf0734b57d3c65dadea5589c15aa1d7a320009db1fe28e89db828b42c8' 
  AND token = 'mbQNbThJncExWMvuSTLM1JyBKPFdwLd32Cdps1Al8mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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