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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '922167a5355ecddd7c76a1f0494f7de9c3b2ca7b26152fd442d0a9dc370bec35' 
  AND token = 'j0uAqatIfh40PioCGoh6gMpSkZ7KnIF+7q2gwFrQwh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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