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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b4a321d3df3428c03a7b6dc504da7931010031b1a28d8483a80fdf83a7900a4' 
  AND token = '2DX8SsnS97JmbHrU0EmNWab9r3n4CdsNv/LFH+iV27Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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