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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43cb4f8fa0edd9ba26f3f68f6e77839905b2eb194bdf17baa4edf436e86f4cc2' 
  AND token = '9YqwOmi5im/eiDlni7A4rGFk99xig4Z5Nn1Ytg2URFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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