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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f682c956ad08080571500b633388f5fc794aba009aabe3f40c8b127afc783c8' 
  AND token = 'AlNnB2whiIw43FBglCKEF8Uaw1pnoUqa84sMsxS25mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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