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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04e3ad5fc94c6e145bdb7bde071941f7ec19d182e5005911b1fdbce4f6cba8f4' 
  AND token = 'T2SkrbyotPWJ4gsaA+Pv8lz15Tr6KpcZEora5iokdEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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