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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ae442566fe7e987c2625e13d663fe288c7116365368c6967d21a0c233339b2c' 
  AND token = 'Ld1oGcVaD/tVbP47MCG480NYW571HCyMb4hFrMyqjf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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