SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52c6ba60d394bc131fd358ab26857ee44fd66b6b47e52303f6e6593d564d34aa' 
  AND token = 'UgLwSEXPQBRyVG9Qz/gKZh9Xb2WdA00biCYwQ5NMbgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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