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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf72b6ad14ccd8d3af288811918ca350713e11bca1cba4fcff3c8e8690e98861' 
  AND token = 'OkvDe9vWJyJkYkKwLtqNKGWF1z1D0gGnFDPylLa5blw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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