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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f906b5f1bc397b8aa50b6e5db6ff7db7e183298e26c57f6d177eadcf9e967581' 
  AND token = 'xEmDBbgUPyUFhtFUJT42MHiD6UNf/6DeVuqsDYqccDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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