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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5efc901599a9ce1df0be1972932c93daa5afb535b230bca30bc6f5619bb1fb72' 
  AND token = 'Q/h5Jm/fwXoWcwXc7jze3is+/k5fAjMGFLgB+h4TF+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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