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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c1b023025b6fca1af1463aa28bc8acc179c642c4f34df8d1dbe65bd3994a184' 
  AND token = 'izaR5C22AnYXX2WJ+nuR3dxY8vbOFA8E8pPohRp1ev4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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