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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23c06af37b0bfe198d915839f26806bf5dd207cead96d8ee59bc40bbf39536c1' 
  AND token = 'RDjprlN3GmxVfJ96cJyPeiIcyDlkJPBbJDc3BxDA81Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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