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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'feac4a1a8c5a3120c6541732cc19745f285e5d7e1ddfcb5a27671275ed70ef3f' 
  AND token = 'oe29dmArCtw8bjt0NZdDWHVMysbYPb4XKpjl3T2bQoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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