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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17c9d3bdbef96613ef3e63621e0f8d1f7cfdd250c77d103bca1b309c4134b807' 
  AND token = 'QZ429XxzZMZA8kydwdn/JkOuQm3uDG+peOCX2kNWhAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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