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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2eb76b1110e145013cba1b37f3b1d3a7792614bc1a62a87a6dd822f4c7528850' 
  AND token = '9Xiku6kAg7qsxN01xs7JDPrS8GnVsXTsnqUa7ZugAYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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