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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1824cf76cc50f4ef39b657cad4117c1f0316266bbe4ce98b915795afc2663ca7' 
  AND token = 'WOEAGlwcIHMzGHocSM0Wu9U7r2+lkG2mOhq74wuQNAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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