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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a14c3d5136a0a11d17b70d9593a5cc33f4251568b8eee3ca2e2894c06732a5a7' 
  AND token = 'Exfz1KJG55uECUnX8VgTCc9d3KH7hnpmVVjrtHQ32WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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