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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ccb57fcc99996c7b72f6ec7a3ea33f1a414d1731a3586808590cc586458ddf7' 
  AND token = '+3ztFCXrw2iEC50bHNQFHjrBVq9ss9XXprY2kPbdxds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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