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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63bf04fb4c1fc405652ad85830632f7a8e54ffee64adee0a28d7350b46323391' 
  AND token = 'wU9noLfu8NWtm9Kag2jPPFKiWwZfLjX8y+PuWb51pb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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