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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6473274616c9d30ef6dca456e2d8519f63de9c8cc620bb98c8d117e19e5b9583' 
  AND token = 'hls1U47iCmQPggl8K3RvOO4S2XiC11iQHYj6vu+56SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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