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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '531fba2c909af15041997c9f6a8d1baf3d1448d6bc1241a4b8b9b801b0b96d45' 
  AND token = 'jjIIVtIxbxphP/dyQy4EfPaCd3KoZYhTrLPz6nvAs3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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