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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08e046cbdff015feced38993e69bfd1263d1fb88185de66ed615e4e0e0866fa6' 
  AND token = 'QK9iYhowmah4x/DXIJuCdk339jx/Fdy5VjtEssyTFaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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