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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce70e8a975297bef85632793f36394d906a3ab2fca2d6541a582c17e8d5b221d' 
  AND token = 't5rEe0l7vfgODq6T8H5/nct6iUnoVbXlY7bx9jncO74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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