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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '209a8044382dc55fffac746518aa6907a353a27d21894c27b637b8014e19f820' 
  AND token = '3B5mA2LSKwO4RmOs229xfgh8+52ElzIqKVikTftcOAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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