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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5162c427d9a8d9b061489a6d4ef4e12e2253d45a815e06bb6dff7179c39e763' 
  AND token = 'PhE8oWQ+alHbqDU2nl3evrNI2a3IRcRewHz0f+FW9ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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