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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '935789ee044ed7086867cf1ab7cd3823e2941c5715525127da5a92b048935743' 
  AND token = '8I2M4hiLQxcf11p/M7uwmOLYjafyPZrCLoOVUacDeLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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