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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf254a28742534e327b7d1b87376abd967658cb522336405d41ec3d36c4b6419' 
  AND token = '3OCMrEycLIkarrGyq2gf8fCSF3vh7x9PRYr5v+KO8Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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