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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '319edde389df3a028a86f3f94ec19cac62600c8c94e32444414f78211fc8640a' 
  AND token = 'CVcY8MWfm5CwbLSkNvYzAOLTG8kugA0i0644iJHKq0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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