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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47de0906495d672b1b4626d6eb5b17acb5d48e6d20709604a766574e12d3f6e9' 
  AND token = 'cBs1U9N0kALNCT7hRLr6LkUJXiDYLEKjnm/kNAYgKuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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