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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00f33c13c4a459361ee0079ddd40fb7b90868ddd1e84e015767b53ee8d2e9c15' 
  AND token = 'LrpKLixE5mZZeKXUEyMHm10YMdigmRCjjXxKmyLb294=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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