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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4fee1cf0b8954a3d3886cadc783e5bcb67263e8806d09d1c1bfff8bb08d09c5' 
  AND token = 'AJcAOdVXuPHUfKWscPfQRMFwZLQnMA5oolkE1V3ac6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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