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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b208903f205dc98f0524350bad396441d709d4c4b88cbb74ceb6410dfdb56130' 
  AND token = 'c3hJzPk++h8TnECNTTM9Yx/W5O4koKCdfg9nK0MPmR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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