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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7af6b0cbb27d65895a5736e5e00d8600510ea369bdd51494cba9ddfe4e341a3e' 
  AND token = 'K7nEhwb86HR2SKLkYI9n3Jxlq/Zdl5ICCShO8DJihu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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