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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32b3178fea8ea6de103eec2206105583575cf41a295ee8851d1052daa8dc0a78' 
  AND token = 'Ql11sfbYGLAbTwZl9GcpqAkCWFCzZYhYZk8OKf3w1N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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