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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ca424ff917b908fc61fda37d33b494d93673357b56268c04433bb9a2c76a342' 
  AND token = 'LlPKc4ozO7w0YN+dFbNFjQal8kC5KpbnP6Vl2OdlT+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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