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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfa9cddf9b739269212780e912edc30c6fa569f1a4d47f7df62b2a9dc10050c9' 
  AND token = 'B/KnjjxsFUZCU5Ix0y10UWOvth/PS3K932oKC5ZUdCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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