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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6df21e44f42e27e8c12bffa9a8a625c662c59fe1fc33f7f2b85b20ac40903f91' 
  AND token = '54/k7tGL6pOkiV/8/WZ1sDJE4bDv4HhovOF0esNdUqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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