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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '253664e1262650878ec8354b4b02f7dcb82a08624d7c1abbe9046282a392e039' 
  AND token = 'Bhj6dWqqjX2+p2iFwmeJ0p6UUen7kg0vo1M1NqpFvGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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