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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66ebf70f15f2fee752902ccfff571b22dea30eabe4c8d22803dd1e4ba44f2d68' 
  AND token = 'J66uuC3bDJCOP11+YhgADDsAAULZX8+F/t1NWgCc2iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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