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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '019c4184bb98fb473efa63deb60051c3db15c1b2026e1af6153f74c221bea309' 
  AND token = 'Y7sYvaqLPa5HbAytgN39SqaaOPSNCm6lE9LMNU7Fi74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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