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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98dcb60b25058f829ba61cd12d66e0955ebbbdba79909f6a77c51e5df2c5402b' 
  AND token = 'PQ5d6DETHhDfefMlJkHd7IFs83s5I9tbh0mYFM6hgdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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