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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '993dc41c038710f3979617711ba0ce0a3fa7589f83fc3becbd09ecf6789400c6' 
  AND token = '7PZ+e/86kpo5loDvhZ/cvPTfJ9QpuBmkzQeWWWA0ysY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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