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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2fccb63bd4d81e686a6b3807fa91fcdc5c90f496364505afa8a36badb375ac1' 
  AND token = 'B/2AvT0cYhmwZ9OoaEbzS/a3U2xK6xfXoc1Ndm8A4eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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