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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6ac1cbc67ce2a1dac729f28352e1721f87ee72bffd50a90f5456ebf8fc84b3b' 
  AND token = 'eIi7GiQ2EMGZMyVeso/mrfBByuMngnnr5nPNz1JqyF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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