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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '136908d7f81c384592ae97d1e88d294186c807462dfe64117cb95a55f31f37e4' 
  AND token = 'uRqU8d0jf+SrE5K0vlJUUtN3nvaU80AMf3nfVkYK56g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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