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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab7db49f054ef930704a1da57eee15b48860f8ab4a1512654595f2d238d4dd72' 
  AND token = 'qFqU2AMs1DmvRED1cd+7RQxXg/bq57uDzcTWX9d3GE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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